Projection Welding for Nut and Bolt Attachment

Projection Welding Nuts

Punched fasteners like nuts, bolts, and studs are needed to build a modern car’s body ultimately. With this, weld-nut selection has increased in today’s competitive market as it differs by texture, material, and national standards even covered some. In this guide, we will list down the essential factors that you need to know about projection welding nuts.


An apple hanging from a tree

Project welding is an extremely crucial task. It is also the most common method for nut and M- or T-thread bolding. The common thing that you should observe and strictly follow is to ensure the quality of the fasteners’ attachment to the stamped body as it will make or break the final product’s outcome.

One of the best things to do is sort out any issues or problems. You can check the tools and equipment to have results that will last for a long period. The process will be flawless once everything is ready.


A close up of a fruit hanging from a tree

There is another term for projection welding, and that is “resistance fastener welding.” Projection welding has a resemblance to the resistance spot welding method. The method is used to achieve the best and correct results.

Ideally, the aim is to shorten the overall time of welding. As much as possible, you must optimize all the parameters to prevent these projection welding nuts to overheat and to refrain from metal expulsion.

The overall process is composed of three key phases, such as the project’s contact with the mating sheet, then the current will begin to heat the projection, and lastly, the fusion will take place due to electrode force.

Common Problems

As mentioned earlier, project welding is a challenging method, so it is prone to encounter several problems. As soon as possible, the problem should be resolved to have a successful attachment. You should be wary of the following as you may experience these one way or another, weld splash in threads, the nut body’s collapsing, and hole misalignment.

One problem is weld splash will not stick into the thread. When this happens, there will be a low electrode force and short period of squeeze time. When in time, the thread distorts, the nut body will break down. It is best to use high force and high current to solve the problem.


Now that you know an adequate knowledge about welding nuts, it’s also essential for you to know the guidelines so that your weld-nuts will achieve optimal results. You will achieve a flawless process when everything is ready and well.

Some factors to remember are checking the equipment regularly (must ensure that they are always in proper sizing); you should also guarantee that the electrodes are flat and aligned correctly. Lastly, you must verify for hostile testing or the torque test.

The attachment can take up a short period of time and if you will do it well, the results will be amazing. Do you know any more facts and guidelines about projection welding nuts that we can add to our list? Share them below!

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